Returns the string containing the formatted representation of the time span.

The following format specifiers are allowed after %:

H - Number of Hours

M - Number of Minutes

S - Number of Seconds

l - Number of Milliseconds

D - Number of Days

E - Number of Weeks

% - The percent character

Note that, for example, the number of hours in the description above is not well defined: it can be either the total number of hours (for example, for a time span of 50 hours this would be 50) or just the hour part of the time span, which would be 2 in this case as 50 hours is equal to 2 days and 2 hours.

wxTimeSpan resolves this ambiguity in the following way: if there had been, indeed, the D format specified preceding the H, then it is interpreted as 2. Otherwise, it is 50.

The same applies to all other format specifiers: if they follow a specifier of larger unit, only the rest part is taken, otherwise the full value is used.